Can personally confirm. I had to stop lifting when I got a mild COVID case, and a couple weeks in I kept getting the random aches and pains everyone always complains about. At least for me, lifting weights makes them go away (at the cost of some DOMS for a few days, but once you're over that hump you're home free).
Before physical activity, stretch out. After an injury, recover before you try to go full out. You're not 22 any more.
Hold on. That’s the 40-year old advice ! :)
34 reporting in, it's a 30s advice if you are a computer jockey sitting all day every day.
20 to 40 is about "how much can you get" (in terms of physical conditioning), 40 to 60 is about "how long can you keep it", and past 60 is about "how slowly can you lose it". Waiting until 40 to get in shape may be kind of late...